I tried both steps before, but Nuvi cannot be seen as attached device (only in pre-boot mode as Garmin device). If I try to flash Cure firmware, first I get correct Unit ID, start flashing and when loader information displays on the screen of Nuvi, I get (Unit id 0) in updater.exe window and aftre while I get error: CPP-203-2.8 from updater.exe app. I thing, that I need to reformat flash internally, because it is impossible to connect Nuvi as mass storage device. It can be done by update.txt file or by another trick?